Platform



FIG. 1 is a first side view of a platform;

FIG. 2 is a second side view thereof;

FIG. 3 is a first lower perspective view thereof;

FIG. 4 is a second lower perspective view thereof; and,

FIG. 5 is a top perspective view thereof.

The broken lines in the drawings are for environmental purposes only and form no part of the claimed design. 

CLAIM The ornamental design for a platform, as shown and described. 